fix(bundler): reject a top-level non-mapping bundle-catalogs.yml in _merge_config#3659

mnriem merged 4 commits into

github:maingithub/spec-kit:mainfrom

jawwad-ali:fix/bundler-catalog-toplevel-mapping-guardjawwad-ali/spec-kit:fix/bundler-catalog-toplevel-mapping-guardCopy head branch name to clipboard